LearnBitcoin

Rabbit Holes

Pick a rabbit hole.

Self-contained explorations, one concept at a time. Interactive where the topic earns it (live mempool, real difficulty countdowns, actual unit converters). Sourced everywhere. Fall down a hole, come out understanding something well.

Live

Rabbit Hole 9 min

Bitcoin Units

BTC, sats, mBTC, µBTC, Finney. Which unit to use, when, and why there are so many of them.

Rabbit Hole 8 min

The Supply Schedule

21 million, forever. Here's how the math works, and why it can't change.

Rabbit Hole 9 min

Halvings

Every 210,000 blocks, the new-Bitcoin tap halves. Why, when, and what happens after.

Rabbit Hole 13 min

Mining

Hash, nonce, target. The simplest hard problem in the world, and why it secures $T.

Rabbit Hole 6 min

Key Space

2^256. A number so large the universe doesn't have enough atoms to brute-force one.

Rabbit Hole 10 min

UTXOs

Bitcoin does not have balances. It has UTXOs. Once you see them, you can not unsee them.

Rabbit Hole 11 min

The Mempool

Where transactions wait before they are real. The auction-house buffer between you and a block.

Rabbit Hole 12 min

Seed Backup Strategies

Twelve words is your wallet. Lose them and you lose your bitcoin. Here is how serious people back them up.

Rabbit Hole 10 min

The Inflation Bug Postmortem

August 15, 2010: someone created 184 billion BTC out of thin air. Five hours later, it was fixed. Here is the full story.

Rabbit Hole 13 min

Lightning Routing

The Lightning Network is a graph. Sending a payment is finding a path through it. Here is how routing actually works.

Rabbit Hole 9 min

Decentralization

What 'decentralized' actually means, where Bitcoin sits on the spectrum, and how the network has defeated takeover attempts without anyone in charge.

Rabbit Hole 14 min

Quantum and Bitcoin

Quantum is the FUD claim that comes up most often after fiat-debasement and energy. The honest version: the threat is real, the timeline is slow, the fix is governance, and Bitcoin has agency.

Rabbit Hole 15 min

Bitcoin and Energy

Energy is the FUD claim that comes up most often, full stop. The honest version: the consumption is real, the comparisons are rhetorical, the demand profile is unique, and the fix for what is actually broken is already profitable.

Rabbit Hole 12 min

Mt. Gox to FTX: The Custody Graveyard

A decade of crypto custodians that lost their customers' coins, from Mt. Gox to FTX, and the honest case for holding your own keys instead.